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Related Experiment Video

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Clinical Anthropometrics and Body Composition from 3-Dimensional Optical Imaging

Clinical Anthropometrics and Body Composition from 3-Dimensional Optical Imaging

Published on: June 7, 2024

A revised metric for quantifying body shape in vertebrates.

David C Collar¹, Crystal M Reynaga, Andrea B Ward

¹Department of Ecology and Evolutionary Biology, Long Marine Laboratory, University of California, 100 Shaffer Road, Santa Cruz, CA 95060, USA. dccollar@gmail.com

Zoology (Jena, Germany)

|June 11, 2013

Summary

This summary is machine-generated.

A new vertebrate shape index (VSI) quantifies body shape diversity by integrating head, body axis, and vertebral column morphology. This metric aids in understanding the evolutionary pressures driving diverse vertebrate body forms.

Keywords:

Axial skeleton Body shape diversity Comparative anatomy Elongation Locomotion

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Area of Science:

Evolutionary Biology
Comparative Anatomy
Morphometrics

Background:

Quantifying vertebrate body shape diversity has been historically challenging.
Previous metrics often oversimplify shape or focus on limited anatomical features.
A comprehensive approach is needed to capture the multifaceted nature of vertebrate morphology.

Purpose of the Study:

To introduce a novel, comprehensive metric: the vertebrate shape index (VSI).
To demonstrate the VSI's utility in assessing body shape variation across major vertebrate clades.
To explore the functional implications of VSI in relation to locomotion.

Main Methods:

Developed the vertebrate shape index (VSI) by combining four key morphological components: head shape, secondary body axis length, and precaudal/caudal vertebral regions.
Applied VSI to a dataset of 194 species across Actinopterygii, Lissamphibia, Squamata, Aves, and Mammalia.
Utilized radiographs, articulated skeletons, and cleared-and-stained specimens for morphological measurements.

Main Results:

VSI effectively quantifies body shape diversity within and across major vertebrate groups.
Head shape, secondary body axis, and vertebral characteristics were identified as significant independent contributors to shape variation, with varying importance across taxa.
A functional analysis revealed VSI's utility in linking body shape to locomotor modes in ray-finned fishes.

Conclusions:

The vertebrate shape index (VSI) offers a robust tool for analyzing morphological variation underlying body shape evolution.
VSI facilitates the identification of selective pressures shaping diverse vertebrate forms.
This metric holds significant promise for future research in evolutionary morphology and functional anatomy.